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Patented Dec. 22, 1925.

UNITED STATES PATENT OFFICE.

mam HAAGN, OI EANAU-ON-THE-KAIN, GERMANY, ABSIGNOB TO THE OOBPOBA- TIOH 01' W. G. KEBAEUS, GESELLBGHAIT m IBESCHBANITIR HAI'IUNG, OI

mAU-ON-THE-HAIN, GERMANY.

ALLOY AND ARTICLE PARTIALLY Io Drawing.

To all whom it may concern:

Be-it known that I, ERNST HAAGN a citizen of the German Empire, residing at Hanau-on-the-Main, Germany, have invented certain new and useful Improvements in Alloys and Articles Partially Composed of Same and Processes for Producing the Alloys, of which the following is a specification.

Alloys are known-particularl for the purpose of tipping go d pen ni swhich contain at least 70% of osmium, in association with another metal of the platinum group, especially iridium, platinum, or palladium. Alloys for the same purpose have also been made, consisting of 50% of tungsten, 30% of cobalt or nickel and of platinum.

It has now been found that the tungsten content can be considerably increased and that of the platinum correspondingly lowered, if, in lace of the metals cobalt or nickelwhich lower the melting point-a small addition (not exceeding 3%) of iridium be employed. In such event, the percentage of tungsten may be increased up to 90%.

The products are distinguished by great hardness and hi h breaking strength. The components can melted together without any injurious secondary effects, if said com-.

ponents be powdered and then compressed into the form of a small cylinder and subjected to the action of an electric are light the meltin process being accomplished uickly an in presence of a current of re ducing gas such as hydrogen. The melting can also be effected by means of cathode rays instead of an electric arc.

A suitable composition is 90% tungsten, 8% platinum an 2% iridium. The. irid- OOHPOBED O1 SAME AND PROCESS FOB-PRODUCING v THE ALLOY.

Application fled August 21, 1924. Serial No. mass.

ium content may vary between 1% and 3%, and the ratio of tungsten to platinum may also var 1 in a similar manner.

The a loy is easily soldered on other metals, and in addition to bein used for the tips of gold pen nibs, is app icable to similar purposes, e. g. needles for talkin machmes, or compass pins, in which it 1s desired that the tip should consist of a material exhibiting great hardness and in some cases also considerable acid-resisting powers.

What I claim and desire to secure by Letters Patent is the followin 1. An alloy consisting of 80-90% of tungsten, 10-17% of platinum and 143% of iridium.

2. Pointed articles, the tips of which consist of an alloy, consistin of 80-90% of tungsten, 10-17% of platinum and 1-3% of iridium.

3. Process for the production of an alloy, consisting of 80-90% of tungsten, 10-17%, of platinum and 1-3% of iridium, which process consists in that the specified proportions of the components are owdered, compressed into a small block an exposed to a luminous electric arc in a current of reducing gas.

4. Process for the production of an alloy containing tun n and metals of the platinum group, w ich process consistsin owdering the tungsten and the'metals o the platinum group to be alloyed therewith, com ressing the powdered ingredients into bloc form, and then exposing them to the action of an electric arc in a reducing atthat -I claim the foregoing- 

